Vacuum Solar Thermal Panel Pressure Indicator for Vacuum Loss
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Solution Overview
Problem
Vacuum solar thermal panels face challenges in detecting internal pressure increases above 10−3 Torr, which can lead to efficiency degradation, as visual inspections are insufficient and attaching high vacuum gauges to each panel is costly and impractical.
Innovation Solution
A vacuum solar thermal panel with a pressure indicator spot of reactive material, such as elemental barium, deposited on the inner side of the front plate, which reacts visibly when internal pressure exceeds a threshold, allowing for timely detection of vacuum loss without compromising panel efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a high vacuum gauge is attached to each panel to detect internal pressure, then measurement precision is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The invention extracts the detection function from a complex external gauge and implements it as a simple reactive material spot directly on the panel. The reactive material (e.g., barium) is deposited on the inner side of the front plate and reacts visibly when internal pressure exceeds the threshold, providing accurate pressure detection without requiring external gauge equipment.
Solution Approach 2:
The reactive material spot serves as a low-cost, single-use indicator that provides accurate pressure detection information. Once the reactive material reacts and changes color, the indicator has served its purpose and the panel can be replaced, eliminating the need for expensive, maintainable electronic gauges on each panel.
2Ease of operation
If a large area reactive material spot is used for pressure indication, then ease of operation is improved, but solar radiation transmission deteriorates
Solution Approach 1:
The reactive material spot is placed in a specific local area on the inner side of the front plate rather than covering the entire surface. This localized placement allows the spot to be large enough for easy visual detection while minimizing the impact on solar radiation transmission through the front plate.
Solution Approach 2:
The reactive material undergoes a visible color change when it reacts with gas molecules at elevated pressures. This color transformation provides a clear, easily detectable signal that does not require the spot to be large, as the color contrast makes it visible from a distance.
3Device complexity
If visual inspection is used to detect pressure loss, then device complexity is reduced, but measurement precision deteriorates
Solution Approach 1:
The reactive material spot provides a clear color change signal that transitions from silvery to white when pressure exceeds the threshold. This visual color transformation enables accurate pressure detection through simple visual inspection, eliminating the need for complex electronic detection systems while maintaining measurement precision at the 10^-2 Torr level.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides a cost-effective and accurate method to detect pressure increases above 10−2 Torr, enabling timely replacement of panels and maintaining efficiency, with the reactive material spot being small enough not to obstruct solar radiation and using a non-evaporable getter for maintaining vacuum.
Implementation Method 1
the reactive material undergoes a reaction noticeable from the outside of the vacuum-tight envelope
Implementation Method 2
a getter material, which is able to capture the residual gas molecules by means of chemical reactions and or adsorption
Implementation Method 3
main getter means for keeping high vacuum within the vacuum envelope
Data Source
AI summary
The present application relates to a vacuum solar thermal panel (1) of the type comprising: a vacuum-tight envelope (10), having at least a front plate (11) transparent to solar radiation and a support structure (12) for said front plate (11); heat-absorbing means enclosed within said vacuum-tight envelope (10); and main getter means for keeping a vacuum condition within the vacuum envelope (10); wherein the vacuum solar thermal panel (1) further comprises a pressure indicator spot (13) of reactive material deposited on an inner side of said front plate (11), said reactive material undergoing a reaction noticeable from the outside of the vacuum-tight envelope (11) when the pressure within said envelope exceeds a given threshold.